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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Change in useful life of the vessels Adjustment | Dec. 31, 2012 Vessels Minimum | Dec. 31, 2012 Vessels Maximum | Dec. 31, 2012 Machinery and equipment Minimum | Dec. 31, 2012 Machinery and equipment Maximum | Dec. 31, 2012 Terminal Facilities Minimum | Dec. 31, 2012 Terminal Facilities Maximum
Dry-docking |  |  |  |  |  |  |  |  |  |
Dry-dock interval, minimum | 2 years |  |  |  |  |  |  |  |  |
Dry-dock interval, maximum | 5 years |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  | 10 years | 40 years | 2 years | 20 years | 3 years | 35 years
Depreciation Expense | $ 70.6 | $ 69.4 | $ 68.1 | $ (1.1) |  |  |  |  |  |

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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